Lock Screen back and forward doesn't function

Hey. In the lock screen mode back and forward buttons doesn't do anything. Pause functions as usual. To move between the tracks, have to go to app and push buttons there. Started after the last update for me. Also the exit button in the lock screen menu for Spotify is gone after the update, which is sad, but maybe intended, I don't know. Has anyone the same problem? Running Android version 6.0.1. Thanks!
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